FreeRDP is a free implementation of the Remote Desktop Protocol.
FreeRDP is a free implementation of the Remote Desktop Protocol. From 3.21.0 before 3.28.0, FreeRDP clients using the GFX pipeline contain an incomplete fix for CVE-2026-23530 in planar_decompress_plane_rle_only in libfreerdp/codec/planar.c, allowing a malicious RDP server to send a truncated RDPGFX_CMDID_WIRETOSURFACE_1 planar payload that reads one byte past the input buffer. This issue is fixed in version 3.28.0.
AI Analysis
Technical Summary
The vulnerability exists in FreeRDP clients using the GFX pipeline between versions 3.21.0 and before 3.28.0. It is an incomplete fix for CVE-2026-23530 in the planar_decompress_plane_rle_only function within libfreerdp/codec/planar.c. A malicious RDP server can send a truncated RDPGFX_CMDID_WIRETOSURFACE_1 planar payload that triggers a read of one byte past the input buffer, potentially leading to memory safety issues. The vulnerability is fixed in version 3.28.0.
Potential Impact
A malicious RDP server can exploit this vulnerability to cause the FreeRDP client to read one byte beyond the intended input buffer. This may lead to memory corruption or information disclosure, depending on the context of the out-of-bounds read. No known exploits in the wild have been reported.
Mitigation Recommendations
Upgrade FreeRDP to version 3.28.0 or later, where this vulnerability is fixed. Since this is a client-side vulnerability triggered by a malicious server, ensure that clients are updated to prevent exploitation.
FreeRDP is a free implementation of the Remote Desktop Protocol.
Description
FreeRDP is a free implementation of the Remote Desktop Protocol. From 3.21.0 before 3.28.0, FreeRDP clients using the GFX pipeline contain an incomplete fix for CVE-2026-23530 in planar_decompress_plane_rle_only in libfreerdp/codec/planar.c, allowing a malicious RDP server to send a truncated RDPGFX_CMDID_WIRETOSURFACE_1 planar payload that reads one byte past the input buffer. This issue is fixed in version 3.28.0.
CVSS v4.0
Affected software
pkg:deb/ubuntu/[email protected]~git20140921.1.440916e+dfsg1-5ubuntu1.4?arch=source&distro=xenialpkg:deb/ubuntu/[email protected]+dfsg1-0ubuntu0.18.04.4+esm6?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]~git20140921.1.440916e+dfsg1-15ubuntu1.18.04.2?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]+dfsg1-0ubuntu0.20.04.2+esm4?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]+dfsg1-3ubuntu2.11?arch=source&distro=jammypkg:deb/ubuntu/[email protected]+dfsg1-0ubuntu1.6?arch=source&distro=noblepkg:deb/ubuntu/[email protected]+dfsg1-1ubuntu0.1~esm6?arch=source&distro=esm-apps/noblepkg:deb/ubuntu/[email protected]+dfsg-2ubuntu0.5?arch=source&distro=questingpkg:deb/ubuntu/[email protected]+dfsg-1ubuntu1.1?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability exists in FreeRDP clients using the GFX pipeline between versions 3.21.0 and before 3.28.0. It is an incomplete fix for CVE-2026-23530 in the planar_decompress_plane_rle_only function within libfreerdp/codec/planar.c. A malicious RDP server can send a truncated RDPGFX_CMDID_WIRETOSURFACE_1 planar payload that triggers a read of one byte past the input buffer, potentially leading to memory safety issues. The vulnerability is fixed in version 3.28.0.
Potential Impact
A malicious RDP server can exploit this vulnerability to cause the FreeRDP client to read one byte beyond the intended input buffer. This may lead to memory corruption or information disclosure, depending on the context of the out-of-bounds read. No known exploits in the wild have been reported.
Mitigation Recommendations
Upgrade FreeRDP to version 3.28.0 or later, where this vulnerability is fixed. Since this is a client-side vulnerability triggered by a malicious server, ensure that clients are updated to prevent exploitation.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-57158
- Osv Schema Version
- 1.7.0
- Aliases
- []
- Ecosystems
- ["Ubuntu:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Pro:24.04:LTS","Ubuntu:25.10","Ubuntu:26.04:LTS"]
- Database Specific Severity
- null
- Cvss Version
- 4.0
Threat ID: 6a58b46f68715ace43d8399b
Added to database: 07/16/2026, 10:37:35 UTC
Last enriched: 07/16/2026, 11:43:33 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 4
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